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Discussion Starter · #1 ·
Looking for a bit of help.

My Jeep configuration is:

2010, 2 Door Jeep JK, Manual trans, 4:88 gears 35” tires, Ripp Supercharger, stage II (meaning with the intercooler) long tube headers also from Ripp and Borla cat back.

The problem I am having is that the Jeep will not pass New Hampshire state emissions. No Check engine light but the following codes:

P0171 bank 1 fuel system too lean
P0174 bank 2 fuel system too lean

In looking into the codes it appears to be saying the downstream O2 sensors are not efficient.

I don’t know exactly what this means.

I initially requested help from Ripp. They advised me to update to the newest software. This was a bit of a problem because both my version and programmer version were out of date. The Diablo guys were especially helpful with this and eventually they walked me through everything and I got the Jeep up to date and I do believe it runs a bit better than it did with my previous version. I was at 2.6, updated to 3.3.

At the time the guys at Ripp told me I needed to run it a bit before again testing the emissions which was a couple weeks ago and I have put maybe 500 miles on it since. Still will not pass. Codes will come back if I clear them. I have requested help or at least some direction from the Ripp guys but have heard nothing back. Mike at Diablo has tried to help in telling me that he thinks it is likely a leak in the intake system. I spent time looking at this today but found no problems or leaks anywhere in the intake.

I have about 39000 on the Jeep, roughly 20k of that is with the supercharger and exhaust from Ripp. I have never previously had a problem passing emissions and after some early problems the Jeep has generally run very good. Fuel milage was initially 16ish after the install but dropped to 13.5-14 by the time I got to the 2.6 tune. Mileage has never been a big concern.

In researching the codes, they pointed me to the downstream O2 sensors, the cats or an exhaust leak. I have thoroughly gone through the exhaust and intake systems for leaks…no problem found. I have checked the O2 wiring and connectors for any issues related to heat or damage from touching pipes and such. All appear to be good. The Diablo tuner allows me to look at the sensors live and they appear to be working. The cats/Y pipe have only 20kish on them so I would not think they are bad. I have asked Ripp if there is any known issue but no response from them so I’d like to know if any of you other guys with this set up have had any issues of the like?

I’d normally take it to the dealer as emissions issues are generally covered for a long time on new vehicles but this having all the add on I can’t do so without paying for hourly labor…potentially a lot…I sought guidance from Ripp and they were a bit impatient with me just with the tune and no response at all this week when writing that I still have a problem. I don’t think it has anything to do with the supercharger but I am also using their cats and tune.

I’m getting desperate here… pulled over twice today by police from 2 different towns!!

Anyone have any experience with this kind of issue? Any ideas? I just don’t know where to go next in troubleshooting it. Any advise or ideas would be greatly appreciated.

Thanks,

V
 

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Have you thought about putting the stock belt back on and running it in stock mode? Or even the stock belt and restoring the original tune from the Diablo? Then the SC is not in the system....this is one of the advantages of the Vortech unit, it will pass air even when not running.
 

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Your running lean. P0171,174 is generic OBD II's way of telling you you have reached your adaptive lean limit. The PCM has reached it's limit (about 30%) of additional fuel supplied.

Too much air or too little fuel will cause this condition. The wrong fuel (E85) will cause these codes. Improper calibration, especially MAF based operating systems will cause these codes. Your JK is speed density so no problem there.

Log long term fuel trims LTFT's bank 1 and 2 upstream. B1S1 and B2S1. It is important they run close to 0 as possible. If you get in the +/- 20's something is wrong. Intake leak, low fuel pressure, etc. Identify the problem and get LTFT's close to 0 and your codes will go away. Ignore STFT's short term fuel trims they don't mean a lot.
 

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What's your AFR at? Is it possible that your tune is simply not commanding enough fuel and your o2s are reading the lean condition?
 

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Sounds like an air leak somewhere or maybe need to change fuel filters. Is everything properly connected and secure?
I translated Mechanic-speak from VEGASROBBI. :cheers2:
 

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Discussion Starter · #8 ·
OK, you guys mean where? I checked upper plenum and TB, all seems ok. I'll pull it all apart and check further as needed but where have you seen this? There does not appear to be many places it can leak? Meaning a vacuum leak? Info is much appreciated! Keep the ideas coming!
 

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Assuming it's not your RIPP S/C or tune...

Here is a list of possible causes for your codes, (from the factory service manual).
The list of things to check under these headings, especially Engine Mechanical, is very long.

Possible Causes

RESTRICTED FUEL SUPPLY LINE

FUEL PUMP INLET STRAINER PLUGGED

FUEL PUMP MODULE

O2 SIGNAL CIRCUIT

O2 RETURN CIRCUIT

O2 SENSOR

MAP SENSOR

ECT SENSOR

ENGINE MECHANICAL

FUEL FILTER/PRESSURE REGULATOR

POWERTRAIN CONTROL MODULE (PCM)
 

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I known leak location is at the EGR connection to the plenum...might want to recheck that connection and gasket...just another 2 cents to the pot.
 

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^^X2. Also, did you torque the plenum too much or too little? And did you use the correct tightening sequence?

One of my plenum rings/rubbers/gaskets was torn and replaced all with new set from dealer ($50).

Just some ideas...

Sent from my over priced iPhone.
 

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Discussion Starter · #13 ·
OK, Thanks for all th suggestions I'll give it a shot today. I'll start with the EGR connection, I know specifically where you guys mean. If that does not work I'll R&R the upper plenum seals.

Thanks,

Verne
 

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Your codes are not for downstream it is for upstream 02 sensors they are both reading lean. What the above posts have told you is all great info. Sounds like you have a vacuum leak somewhere or low fuel pressure. It has to be something that effects both banks of the engine. Doing a smoke test on intake or spraying the intake down with brake clean only on a cold motor are both good ways of finding vacuum leaks. Don't attempt to spray brake clean on hot motor because you could start a fire.
 

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Same problem

Wow. I thought I was the only one. Won't pass emissions because of the check engine light. Clear it and it comes back eventually (1hr-3days). Same setup.. RIPP Stage 2, Borla exhaust, on a Rubicon with 35s. It all started with the install and I have had the same answers from RIPP. No leaks that I can find. I will say if you go back to stock, and not rollback the injectors, it will run like crap and I would guess, not pass emissions either. I would like to know if you have solved the problem. I could use the solution right about now.
 

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Wow. I thought I was the only one. Won't pass emissions because of the check engine light. Clear it and it comes back eventually (1hr-3days). Same setup.. RIPP Stage 2, Borla exhaust, on a Rubicon with 35s. It all started with the install and I have had the same answers from RIPP. No leaks that I can find. I will say if you go back to stock, and not rollback the injectors, it will run like crap and I would guess, not pass emissions either. I would like to know if you have solved the problem. I could use the solution right about now.
Please take a data log with the included diablosport tuner and forward it along with the files that say "last tune written" and "original backup" to [email protected] please include a brief explanation of your problem.
 

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Discussion Starter · #18 ·
I would recommend contacting RIPP and they will facilitate with Diablo as needed. The Diablo guys were very helpful however mine is still unresolved. I have been living in China for 9 months and wont return full time to the US until this summer and before that it was parked for months with a broken axle. I don't put many miles on my cars...but they are hard miles!

I have tried numerous tunes the Diablo guys have given me have given me and none have resolved the issue. That said I think mine is the exception as I have heard few other issues of the nature.

The tunes all pertain to O2 sensors being in what state I believe.

I'll pursue when I get home but please let me know how it goes with yours once it's resolved.

V
 

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Monitor and log your long term fuel trims(LTFT) B1 and B2. Observe where they are running at idle cruise and acceleration. Plus means the PCM is adding fuel and minus means the PCM is subtracting fuel from the base fuel calulation. So + 10 means the PCM is adding 10% more fuel than the cal has programmed as base fuel delivery.

At + 25-30% a P0171,174 will be thrown (B1 and B2). Conversely a P0172, 174 indicates a rich condition and the PCM is removing fuel. If only one bank throws a lean code it is likely there is an air leak or bad injector, etc on that side only. If 171, 174 are thrown together it is likely a common cause like low fuel pressure or large air leak.

Here's where it gets tricky, Chrysler runs their engines in speed density without actual air flow data reverting to a look up table instead. With the GM LS OS's we can fine tune airflow vs fuel using the MAF calibration. With Chrysler running in speed density (MAP) intake manifold pressure (vaccum) is critical and tables are used to calculate airflow based on rpm, intake vaccum, temperature, etc.

Add boost to a 1 bar OS and those tuners have their work cut out for them. So your issue may be in the calibration, send the data to Ripp.

I always display LTFT on any scan gauge I use while driving, between that and the O2 feedback you can tell a lot. Set your scan tool to watch LTFT's, where are trims high? Idle, cruise, boost? Many OS's go information performance enrichment (open loop) under hard acceleration and other driving conditions like DFCO (decelleration fuel cut off) and LTFT's are ignored so monitor during normal driving conditions in CL(closed loop).
 

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I will send a log once I get these last 3 sensors to reset and try my luck. O2, EGR, and Catalyst have not reset yet after 250 miles. If the code trips before I make emissions, I will log it. I have already sent my original tune and the tune given to RIPP. I have not heard back for over a week. This next time I will send a log with it. As I said, 250 miles, no CEL, but the sensors have not reset yet.
 
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